1: (3-methyl-isoxazol-5-yl)acetic acid With n-butyllithium in tetrahydrofuran; hexane T=-70°C; 0.5 h; 2: o-chloro benzoic acid chloride in tetrahydrofuran; hexane T=-60°C; 0.166667 h; 3: With hydrogenchloride; water in tetrahydrofuran; hexane